Inorganic and organic N-transformations in limed and unlimed soil as influenced by cropping and N-saturation

• Published in: Soil biology & biochemistry Vol. 22; no. 3; pp. 327 - 330
• Main Authors: Ghosh, Sudipta Kumar, Mukhopadhyay, Asit K., Saha, Dipankar
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1990; New York, NY Elsevier Science
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Chemical, physicochemical, biochemical and biological properties; Fundamental and applied biological sciences. Psychology; Organic matter; Physics, chemistry, biochemistry and biology of agricultural and forest soils; Soil science; Zea mays; Nitrogen fertilization; Cultural practice; Monocotyledones; Ammonium; Acid soil; Transformation; Zea mays; Saturation; Cultivated soil; Alfisols; Nitrogen; In vitro; Cereal crop; Inorganic compound; Tropical soil; Liming amendment; Nitrogen balance; Gramineae; Angiospermae; Spermatophyta; Organic compounds
• ISSN: 0038-0717; 1879-3428
• DOI: 10.1016/0038-0717(90)90108-C

Irrespective of liming and N-saturation. all forms of inorganic and organic N in soil tended to decrease due to cropping of maize for one month. The decrease was more pronounced in N-treated limed soil than the corresponding unlimed soil. In both unlimed and limed situations total hydrolysable organic N was found to decrease more in the N-treated than the corresponding untreated system not receiving N. The largest decrease in total N due to cropping in the N-treated limed soil corresponded with the largest increase in N-uptake by the crop. Results from a soil N balance showed that a greater amount of N was unaccounted for in N-saturated limed soil. Fixed NH +-N declined with cropping, particularly from N-saturated soils. It is suggested that the role of fixed NH 4 +-N must be taken into consideration in any N-transformation study.